Permutation-lock.



G. O. BETHKE.

PEHMUTATION LOCK.

APPLICATION FILED JAN. 15. 1914.

Patented Aug. 24, 1915.

3 SHEETSSHEET COLUMBIA PLANouMPH c0.. WASHINGTON. D. z:v

G. O. BETHKE.

PERMUTATION LOCK.

APPLICATION FILED JAN. 15. 1914.

l 1 5 1 ,3 35 v Patented Aug. 24, 1915.

3 SHEETSSHEET Z.

31H 4 A I E 12 WW G. 0. BETHKE.

PERMUTATION LOCK.

APPLICATION FILEDIJAN. 15, 19M.

1,]. 5 l ,335 Patented Aug. 24, 1915.

3 SHEETS-SHEET 3.

J2 zz rig-17W r r QGZOZMA UNITE) SAE GUSTAV 0. BETHKE, or CHICAGO, rumors, Assrcavon or ONE-HALF TO EDWARD o. r anna, or CHICAGO, ILLINOIS.

PERIVIU'LATION-LOCK,

Specification of Letters Patent.

Patented Aug. 24, 1915.

' Application filed January 15, 1314. Serial No. 812,231.

To all whom it may concern Be it known that I, GrUSTAV O. BETHKE, a citizen of the United States, and a resident ,of the city of Chicago, countyof Cook, and State of Illinois, have invented certain new and useful Improvements in Permutation- Locks,'of which the followingis a specification.

My invention relates to improvements in permutation locks and has for its object the provision of an improved construction of this character which is simple and efiicient in use.

Other objects will appear hereinafter.

The invention consists in the combinations and arrangements of parts hereinafter de scribed and claimed.

The invention will be best understood by reference to the accompanying drawings forming a part of this specification, and in which- Figure 1 is a section taken through a door and lock embodying my invention, the same being taken on substantially line 0ct0 of Fig. 2, Fig. 2, a section taken on substantially line y 2 of Fig. 1, Fig. 3, a side elevation of a stem employed in the construction, Fig. 4, a top plan view corresponding with Fig. 3, Fig. 5 is a longitudinal central section taken through the lock, Fig. 6, a plan view of a locking plate employed in the construction, Fig. 7, a plan view of another locking plate employed in the construction, Fig. 8, a perspective view of a slidable member employed in the construction,'Fig. 9, a perspective view of a slidable bolt employed in the construction, Fig. 10, a detail section illustrating means for changing the combination of the lock, Fig. 11, a section similar to Fig. 1, but showing a modified form of construction, and Fig. 12, a section taken on lines ez of Fig. 11.

The form of construction illustrated in Figs. 1 to 10 inclusive comprises a suitable casing 1 which is adapted to be mounted in the free edge of a door 2 in the usual manner. A bolt 3 is slidably mounted in casing 1 so as to protrude from the edge of the door to constitute a locking means in the usual manner, said bolt being provided with an operating knob 3 which projects through a slot provided in said casing on the inner side of said door. Bolt 3 is normally held in projecting or looking position by means plate 7 engages so as to permit of independent withdrawal of bolt 3 but cause withdrawal of said bolt whenever plate 7 is withdrawn, as will be readily understood. Plate 7 carries an upstanding projection 11 which is adapted to enter notches 12 and 13 in tumblers 14 and 15 which are mounted to rotate freely on stem 6, an operating segment or arm 6 being secured to stem 6 between said tumblers, as indicated. Tumblers 14 and 15 carry on their inner faces pins 16 and 17 projecting inwardly and adapted to be engaged by the edges of arm 6. Tumblers 14 and 15 are also provided with shallow detent notches 18 and spring held detents 19 are provided with noses 20v riding upon the peripheries of tumblers 14 and 15, the notches 18 being so positioned relatively to notches 12 and 13 so that detents 19 yield ingly engage notches 18 when notches 12 and 13 are in registration to rec eive projection 11, said notches 18 being provided to facilitate the positioning of notches 12 and 13. The tumblers 14 and 15 may also be provided with one or more decoy notches 18 which are designed to mislead anyone attempting to open the lock surreptitiously.

Flange 10 at the inner end of plate 7 is provided with a projection 21 slidably engaging a slot 22. in an arm 22 which is fixed to a stem 23, said stem 23 extending to the outer side of the door 2 where it is provided with an operating knob 23. rangement it will be observed, that when tumblers 14 and 15 are properly set with notches 12 and 13 in registration with projection 11, bolt 3 may be withdrawn by manipulation of knob 23, but unless notches 12 and 13 are in registration it is impossible to withdraw bolt 3 by manipulating knob 23", it being possible only to withdraw said bolt by manipulating stem 3 on the inside of the door. It will also be observed that the tumblers 14 and 15 may be readily set with notches 12 and 13 in registration by By this armeans of stem 6 if the operator was aware of the proper positions in which to place tumblers 14: and 15. v

A locking dog 24- is 'rotatably mounted on a stem 25 which projects from casing 1 on the inside of the door, said locking dog being adapted to engage either of the notches 26 in the edge of bolt 3 and lock said bolt against sliding in either of its positions independently of tumblers 14 and 15.

A knob 27 carrying a graduated disk 28 is secured to the outer end of stem 6 by means of a set screw 29, the inner face of said knob, surrounding stem 6, being provided with a plurality of notches 30 adapted to receive a pin 31 in said stem 6. By this arrangement, it will be observed, that by loosening'set screw 29 and partially withdrawing knob 27, the relative positions of disk 28 and stem 6 may be changed to change the combination of the lock.

' justment between the disk 28 and stem 6 as before. At its inner end stem 33 carries an arm orfinger 36 which engages a notch 37 in plate 7, so that when knob 34: is turned, plate 7 and consequently'bolt 3 may be operated as before.

While I have illustrated and described the preferred'form of construction for carrying my invention into effect, this is capable of variation and modification without departing from the spirit of the invention. I,

therefore,'do not wish to be limited to the precise details of construction set forth, but

, desire to avail myself of such variations and modifications as come within the scope of the appended claims. 1

Having described my invention what I claim as new and desire to secure by Letters Patent is: o 7

1. A permutation lock comprising a casing; abolt'slidable in said casing; a head on the inner end 01 said bolt; a compression spring between said head and one side of said casing; a member slidably mounted on said bolt,'said bolt and member being slotted; a head on the inner'end of said member resting against the head of said bolt; a rotatablestem passing through said slots; tumblers on said stem; means on said member cooperating with said tumblers;

and means for operating said member, sub-' tantially as described.

2. A permutation lock comprising a casing; a bolt slida-ble in said casing; a head on the inner end of said bolt; a compression spring between said head and one side of said casing; a member slidably mounted on said bolt, said bolt and member being slotted; a head on the inner end of said-member resting against the head of said bolt; a rotatable hollovw stem passing through said slots; tun1blers on said stem; means on said member cooperating with said tumblers;

- and a stem passing through said hollow stem and provided with means for operating said member, substantially as described.

In testimony whereofl have signedmy name to this specification in the presence of two subscribmg witnesses.

c GUSTAV BETHKE;

Witnesses JOSHUA R. H. Po'r'rs, ARTHUR A. OLsoN.

Copies of'this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G. 

